Calculator



Oct. 9, 192s.

' A. HUNAU ET AL CALCULATOR Filed Jan. 3, 1923 INVENTOR Pau/ fiamma/lan Ado/ph Hunau ATTORNEY Patented a. 9, A192s.v

UNITED 'STA-'res 'PATENT OFFICE.

ADOLPH HUNAU AND PAUL HAMMALIAN, QF NEW YORK, N. Y., ASSIGNORS TO H. & H.

('JALG'U'LATING' CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

CALCULATOR.

Application filed January 3, 1923. Serial No, 610,474.

This invention relates to matically and expeditiously ple arithmetical calculations. as addition, subtraction, multiplication and division, in an 6 easy and accurate manner.

ne ofthe objects is to provide an extremely simple apparatus, comprised essentially of only two elements viz, a plate bearing a table composed of a series of rows of numerals arranged longitudinally andtransversely of the plate and a slide also bearing a transverse row ot' numerals in column ardevices for autorangement or registration with the numerals on the plate, the parts being so combined and arranged as to show computation clearly, merely asingle Inovement being required.

Another object is to enable the immediate identication of the factors and the 2 0 result of the calculation preferably by diterentiating the factor rows by distinctively coloring the same and the result row by providing a slot in the slide through which the result row on the plate will be disclosed.

Another purpose is apparatus exceedingly compact, so that it can be as easily carried in a pocket as an ordinary business card. i

A further aim is to produeela device for the foregoing purposes and which may be further usedl as an advertising medium, there being space for display purposes as well as for the necessary numerals used in making the computations.

These several aims, objects and purposes, together with others, such as economical construction, ease of assemblage and neatness of appearance, are accomplished by the novel design, arrangement and combination drawing, forming an es this disclosure, and in i of parts hereinafter described and shown in the accompanying sential part of which Figure 1 is a front elevational view of an' vembodiment of the lnvention, looking from one side thereof.

Figure 2 is a similar view the reverse side.

Figure 3 is a longitudinal sectional view taken on line 3-3 of Figure 1.

Figure 4 is an end view-looking from the bottom of the device. u

The calculator consists essentially of a Hat plate and 'eo-operative slide, the plate,

looking from performing sim-v the results of the.

in the provision of an parallel edges 17 ot its main portion, thefour corners being neatly rounded as shown.

On each o'f the squares 13, on the side 11 of the pl ate, are disposed numerals arranged in horizontal and vertical rows, the numerals reading from'the upper left hand cornerin regular consecutive order, both downwardly and to the right, the corner numeral being thel integer 1.

In a similar manner thel squares on the opposite side 12 of the plate are provided with numerals, the upper and left hand rows `being in consecutive order and the remain-- mgv squares supplied with numerals which rcpresent,f1n each square the product of the' numeralv in the uppermost .horizontal row, directly over it, and the Vnumeral in the rst vertical row alining with it.

An extension 18,integral with the lower edge of the plate, is slit, as at 19, and formed to present a flattened loop or offset cross bar 20 disposed centrally of the plate.

A sectional slide or band is composed of a relatively narrow rectangular plate 21 disposed over the side 11 of the main plate and a corresponding element 22 over the side 12.x

Said slide plate .21 corresponds in length with the width of the plate 10 and has eX- tensions 23 at the central portion of its ends reaching past the plate.

The slide element 22 has its ends formed with mating flanged extensions 24bent reentrantly to project over the plate 10 and ends of the slide element 21, clamping the slide elements rigidly together but allowing movement of the sliderelative .to the plate 10 in a vertical or longitudinal direction, the extending edges of the plate element 15 ac'ting as steps, limiting the upward movement of the slide. The element 21 contains an elongated slot 25 through which any of the horizontal rows of numerals on the squares l13 of side 11 can be seen by properly shifting the slide, and

side of the -element 22 over which are squares 28,

above the slot are a row of uares 26, the first of which contains a bla and the remaining squares a series of numerals advancing in consecutive order from unity.

These numerals, like the first vertical row on the plate, are preferably made in a dill'erent color or style so as to be easily 'differentiated and on the space below the slot, the words Addition & subtraction may appear as shown.

- A similar slot 27 is formed in the slide carrylng a row of numerals correspondingr to those in the uppermost row on the plate and distinguished by color -or shape, as are also the first vertical row of numerals on the side 12 of the plate.

Below the slot the word Multiplication may appear and extending integrally centrally from the lower edge of the slide element 22, is a flat stem 29 suited to engage below the raised bar of the loop 2O to be slidably guided by it.

This stem 29 acts obviously as a handle by which the slide, as a unit, can be conveniently manipulated and the slots brought into registration with desired rows of numerals on each side of the plate 10.

In operation let itbe assumed that it is desired to add four to seven. In order to perform this calculation, the side 11 of the plate is used and by maneuvering, the stem the slot 25 is brought into register with the numeral 4 in the first or left hand vertical row of figures, and the eye. will see displayed, directly below the numeral 7, the figures 11 .which is the sum of four plus seven.

Subtraction is obviously performed in a like but reverse manner,

In performing multiplication the reverse plate is used and, taking the same numbers,

In calculations involving larger amounts than appears on the surface of the plate, the

usual process of carrying the left hand figi\ ures is employed and, as the'calculations are abl viz, four multiplied by seven, the product 28 is'instantly seen.

entirely mechanical, the results are invaricorrect.

rom the foregoing disclosure it will be seen that a simple im lement, easily operated and not readily liable to become disordered has been described as being the preferred embodiment of the invention.

It will be apparent, however, that minor changes may be made in its construction, without the exercise of invention or conflicting with the scope of the claims hereto ap ended.

t will also be understood that in the foregoing description and in the appended claims We have used the word factor in its broad sense as indicating one or a row of elements used in any calculation, and not merely as applied to a numeral or row of numerals used inmultiplication.

aving thus described our invention, what we claim as new and desire to Secure by Letters Patent, is

1. In a calculator of the class described, a plate, a T shaped slide movable longitudinally of said plate, flanges formed on the ends of the upper member of said slide engaging the edges of said plate, said member having an elongated horizontal sight opening, and a loop integral with said plate through which the lower member of said slide extends.

2. Ina calculator of the class described, a plate, a band encompassing said plate and slidable longitudinally thereof, said band having elongated slots through which indicia on each side of said plate may be seen, a fiat stem formed on said band extending centrally over said plate on one side thereof, and means formed integrally with said plate for' guiding said stem, all times into an accessible position.

Signed at New York, in the county of New York and State of New York, this 20th dayl of December A. D. 1922.

.ADoLPH HUNAU. PAUL HAMMALIAN.

said stem extending at 

